4.5L Owners Thread - DeMan Motorsport
#316
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The latest video is out on Hagerty YouTube with Matt Farah doing a full review and drive of the 4.5L GT4.
https://www.youtube.com/watch?v=Im9ARWrNBt8
https://www.youtube.com/watch?v=Im9ARWrNBt8
vid is great to see, but the music overload was unbearable, would have been better to hear the car and talking alone
#317
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The latest video is out on Hagerty YouTube with Matt Farah doing a full review and drive of the 4.5L GT4.
https://www.youtube.com/watch?v=Im9ARWrNBt8
https://www.youtube.com/watch?v=Im9ARWrNBt8
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Rick DeMan (05-06-2021)
#319
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I don't want to speak for anyone, but I think generally the answer is "the shop makes no guarantees neither express nor implied re: emissions, and once the car leaves their possession they assume zero responsibility regarding your state and local laws"
Basically some folks have squeaked them past smog, but if people keep blowing it up online the minders might take notice and the music could come to a stop.
Basically some folks have squeaked them past smog, but if people keep blowing it up online the minders might take notice and the music could come to a stop.
Last edited by burnergt4; 05-06-2021 at 04:07 PM.
#320
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I don't want to speak for anyone, but I think generally the answer is "the shop makes no guarantees neither express nor implied re: emissions, and once the car leaves their possession they assume zero responsibility regarding your state and local laws"
Basically some folks have squeaked them past smog, but if people keep blowing it up online the minders might take notice and the music could come to a stop.
Basically some folks have squeaked them past smog, but if people keep blowing it up online the minders might take notice and the music could come to a stop.
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#322
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#323
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If I stubbornly believe that the X51 heads and cams are not worth it for the price (most gains are in the GT3RS/718 CS IM), can you guys completely reuse the stock heads and just convert the bottom end to 4.5L? I’m not looking to squeeze every ounce of power at the top end since I find hefty low end torque more fun driving to work legally
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#324
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I believe that is exactly what’s done anyway… existing heads are reworked for flow (ported and polished) and then it’s the bottom end as you described, custom crank and the intake.
Happy to be corrected.
Happy to be corrected.
#325
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There are "some" X51 parts used.
When I asked Rick about a quote way back before I changed cars entirely, the conversion cost was lower because I already had an X51 engine.
When I asked Rick about a quote way back before I changed cars entirely, the conversion cost was lower because I already had an X51 engine.
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TDT (05-18-2021)
#326
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If I stubbornly believe that the X51 heads and cams are not worth it for the price (most gains are in the GT3RS/718 CS IM), can you guys completely reuse the stock heads and just convert the bottom end to 4.5L? I’m not looking to squeeze every ounce of power at the top end since I find hefty low end torque more fun driving to work legally ![jumper](https://rennlist.com/forums/graemlins/jumper.gif)
![jumper](https://rennlist.com/forums/graemlins/jumper.gif)
The following 2 users liked this post by twentyseven:
HooosierDaddy (05-20-2021),
Luca Paindelli (05-20-2021)
#327
#329
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AFAIK the gearboxes between the 981 and 718 GT4s are virtually the same—@Luca Paindelli has had both stock gears and DeMan gears in his 981 4.5L, so gearbox-wise his experience might be informative.
Last edited by burnergt4; 06-04-2021 at 04:56 PM.
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ExternalGPU (06-04-2021)
#330
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Top speed is dictated by gearing, not power. You'd need a taller 6th to get at a higher vmax.
AFAIK the gearboxes between the 981 and 718 GT4s are virtually the same—@Luca Paindelli has had both stock gears and DeMan gears in his 981 4.5L, so gearbox-wise his experience might be informative.
AFAIK the gearboxes between the 981 and 718 GT4s are virtually the same—@Luca Paindelli has had both stock gears and DeMan gears in his 981 4.5L, so gearbox-wise his experience might be informative.
I was planning to get the 992 GT3 in Manual. I guess the 4.5L Cayman does shine over the GT3 in most aspects with an exception of the 911 heritage and status. I want this car to be the car that you drive for the sake of driving pleasure. Therefore, it has to be a manual car.
I just had a looked at the website. The Vmax of the 4.5L + DeMan gearing is at 194 mph. I wish it does break the 200mph barrier but hey I rarely go over 300kmh (186mph).
Out of curiosity, is it possible to stretch or modify the gearing ratio to surpass the 200 mph line while keeping the similar driving behaviour of DeMan gear ratio? I'd love to go to DeMan but I am not in the US + Covid 19
![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
How would the car behave if the 6th gear was longer other than the increased top speed?
I don't know much about modding gearing. I just drive.
As for the 718 vs 981 GT4
Is the clutch on the 718 lighter? Is the car required to be upgraded with a new clutch to handle the 4.5L power?
Last edited by ExternalGPU; 06-04-2021 at 07:27 PM.